#pragma once
#include <iostream>
#include <cstring>
#include <fcntl.h>
#include <unistd.h>
namespace qing {
class Term {
public:
	/* 需要输入当前的控制台号(源头tty) */
	Term(int target_tty, int origin_tty) {
		this->origin_tty = origin_tty;
		chvt(target_tty);
		HideCursor(target_tty);
	}
	~Term(){ /* 切回源tty */
		chvt(origin_tty);
	}
private:
	int origin_tty;
	static int open_tty(int num) {
		char path[16] = {'\0'};
		snprintf(path, sizeof(path), "/dev/tty%d", num);
		int d = open(path, O_WRONLY);
		if (d == -1)
			throw std::runtime_error(path);
		else
			return d;
	}
	static void HideCursor(int id) {
		int d = open_tty(id);
		const char *hide = "\033[?25l";
		if (write(d, hide, strlen(hide)) == -1){
			close(d);
			throw std::runtime_error("term writting");
		}
		close(d);
	}
	static void chvt(int id) {
		char cmd[16] = {'\0'};
		snprintf(cmd, sizeof(cmd), "chvt %d", id);
		int err = system(cmd);
		if (err)
			throw std::runtime_error("chvt");
	}
};
}